Ashy Woodswallow
Artamus fuscus
This stocky woodswallow has an ashy grey upperparts with a darker head and a narrow pale band on the rump. The underside is pinkish grey and the short slaty black tail is tipped in white. The finch-like bill is silvery. In flight the long wing looks very broad at the base giving it a very triangular outline. The first primary is very short. The legs are short and the birds usually perch on high vantage points from which they make aerial sallies. There are no geographic variations in plumage and no subspecies have been designated.
ID text from Wikipedia, CC BY-SA 4.0

Dusky Woodswallow
Artamus cyanopterus
The dusky woodswallow is medium-sized and swallow-like, with a dark brown hue, but there have been instances where the bird has appeared grey. The birds have a black patch in front of the eyes, and grey (sometimes also black) wings with white streaks on them. The dusky woodswallow has a black, white-tipped tail with a silver underwing. The birds have a blue-grey bill capped with black. Dusky woodswallows are known to spontaneously 'wag' or swivel their tails fervently, a trait which is common among many other species of woodswallow.
ID text from Wikipedia, CC BY-SA 4.0
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Ashy Woodswallow and Dusky Woodswallow.